I'll be on TG from Bangkok to Brisbane and from Melbourne to Bangkok later this year. My qestions:
What kind of business class will it be? Lie flat? Is it comperable to the one on their 744s to Frankfurt?

I don't know an answer to this question, but I find it interesting too. I try to avoid the old recliners where ever I can. Only when I have the oportunity to come on an A306 I don't care what kind of seat I get as I love flying the old busses